1 /*
2 * Copyright 2006 The Android Open Source Project
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8
9 #include "SkImageDecoder.h"
10 #include "SkBitmap.h"
11 #include "SkImagePriv.h"
12 #include "SkPixelRef.h"
13 #include "SkStream.h"
14 #include "SkTemplates.h"
15 #include "SkCanvas.h"
16
SkImageDecoder()17 SkImageDecoder::SkImageDecoder()
18 : fPeeker(nullptr)
19 , fAllocator(nullptr)
20 , fSampleSize(1)
21 , fDefaultPref(kUnknown_SkColorType)
22 , fPreserveSrcDepth(false)
23 , fDitherImage(true)
24 , fSkipWritingZeroes(false)
25 , fPreferQualityOverSpeed(false)
26 , fRequireUnpremultipliedColors(false) {
27 }
28
~SkImageDecoder()29 SkImageDecoder::~SkImageDecoder() {
30 SkSafeUnref(fPeeker);
31 SkSafeUnref(fAllocator);
32 }
33
copyFieldsToOther(SkImageDecoder * other)34 void SkImageDecoder::copyFieldsToOther(SkImageDecoder* other) {
35 if (nullptr == other) {
36 return;
37 }
38 other->setPeeker(fPeeker);
39 other->setAllocator(fAllocator);
40 other->setSampleSize(fSampleSize);
41 other->setPreserveSrcDepth(fPreserveSrcDepth);
42 other->setDitherImage(fDitherImage);
43 other->setSkipWritingZeroes(fSkipWritingZeroes);
44 other->setPreferQualityOverSpeed(fPreferQualityOverSpeed);
45 other->setRequireUnpremultipliedColors(fRequireUnpremultipliedColors);
46 }
47
getFormat() const48 SkImageDecoder::Format SkImageDecoder::getFormat() const {
49 return kUnknown_Format;
50 }
51
getFormatName() const52 const char* SkImageDecoder::getFormatName() const {
53 return GetFormatName(this->getFormat());
54 }
55
GetFormatName(Format format)56 const char* SkImageDecoder::GetFormatName(Format format) {
57 switch (format) {
58 case kUnknown_Format:
59 return "Unknown Format";
60 case kBMP_Format:
61 return "BMP";
62 case kGIF_Format:
63 return "GIF";
64 case kICO_Format:
65 return "ICO";
66 case kPKM_Format:
67 return "PKM";
68 case kKTX_Format:
69 return "KTX";
70 case kASTC_Format:
71 return "ASTC";
72 case kJPEG_Format:
73 return "JPEG";
74 case kPNG_Format:
75 return "PNG";
76 case kWBMP_Format:
77 return "WBMP";
78 case kWEBP_Format:
79 return "WEBP";
80 default:
81 SkDEBUGFAIL("Invalid format type!");
82 }
83 return "Unknown Format";
84 }
85
setPeeker(SkPngChunkReader * peeker)86 SkPngChunkReader* SkImageDecoder::setPeeker(SkPngChunkReader* peeker) {
87 SkRefCnt_SafeAssign(fPeeker, peeker);
88 return peeker;
89 }
90
setAllocator(SkBitmap::Allocator * alloc)91 SkBitmap::Allocator* SkImageDecoder::setAllocator(SkBitmap::Allocator* alloc) {
92 SkRefCnt_SafeAssign(fAllocator, alloc);
93 return alloc;
94 }
95
setSampleSize(int size)96 void SkImageDecoder::setSampleSize(int size) {
97 if (size < 1) {
98 size = 1;
99 }
100 fSampleSize = size;
101 }
102
allocPixelRef(SkBitmap * bitmap,SkColorTable * ctable) const103 bool SkImageDecoder::allocPixelRef(SkBitmap* bitmap,
104 SkColorTable* ctable) const {
105 return bitmap->tryAllocPixels(fAllocator, ctable);
106 }
107
108 ///////////////////////////////////////////////////////////////////////////////
109
getPrefColorType(SrcDepth srcDepth,bool srcHasAlpha) const110 SkColorType SkImageDecoder::getPrefColorType(SrcDepth srcDepth, bool srcHasAlpha) const {
111 SkColorType ct = fDefaultPref;
112 if (fPreserveSrcDepth) {
113 switch (srcDepth) {
114 case kIndex_SrcDepth:
115 ct = kIndex_8_SkColorType;
116 break;
117 case k8BitGray_SrcDepth:
118 ct = kN32_SkColorType;
119 break;
120 case k32Bit_SrcDepth:
121 ct = kN32_SkColorType;
122 break;
123 }
124 }
125 return ct;
126 }
127
decode(SkStream * stream,SkBitmap * bm,SkColorType pref,Mode mode)128 SkImageDecoder::Result SkImageDecoder::decode(SkStream* stream, SkBitmap* bm, SkColorType pref,
129 Mode mode) {
130 // we reset this to false before calling onDecode
131 fShouldCancelDecode = false;
132 // assign this, for use by getPrefColorType(), in case fUsePrefTable is false
133 fDefaultPref = pref;
134
135 // pass a temporary bitmap, so that if we return false, we are assured of
136 // leaving the caller's bitmap untouched.
137 SkBitmap tmp;
138 const Result result = this->onDecode(stream, &tmp, mode);
139 if (kFailure != result) {
140 bm->swap(tmp);
141 }
142 return result;
143 }
144
145 ///////////////////////////////////////////////////////////////////////////////
146
DecodeFile(const char file[],SkBitmap * bm,SkColorType pref,Mode mode,Format * format)147 bool SkImageDecoder::DecodeFile(const char file[], SkBitmap* bm, SkColorType pref, Mode mode,
148 Format* format) {
149 SkASSERT(file);
150 SkASSERT(bm);
151
152 SkAutoTDelete<SkStreamRewindable> stream(SkStream::NewFromFile(file));
153 if (stream.get()) {
154 if (SkImageDecoder::DecodeStream(stream, bm, pref, mode, format)) {
155 if (SkPixelRef* pr = bm->pixelRef()) {
156 pr->setURI(file);
157 }
158 return true;
159 }
160 }
161 return false;
162 }
163
DecodeMemory(const void * buffer,size_t size,SkBitmap * bm,SkColorType pref,Mode mode,Format * format)164 bool SkImageDecoder::DecodeMemory(const void* buffer, size_t size, SkBitmap* bm, SkColorType pref,
165 Mode mode, Format* format) {
166 if (0 == size) {
167 return false;
168 }
169 SkASSERT(buffer);
170
171 SkMemoryStream stream(buffer, size);
172 return SkImageDecoder::DecodeStream(&stream, bm, pref, mode, format);
173 }
174
DecodeStream(SkStreamRewindable * stream,SkBitmap * bm,SkColorType pref,Mode mode,Format * format)175 bool SkImageDecoder::DecodeStream(SkStreamRewindable* stream, SkBitmap* bm, SkColorType pref,
176 Mode mode, Format* format) {
177 SkASSERT(stream);
178 SkASSERT(bm);
179
180 bool success = false;
181 SkImageDecoder* codec = SkImageDecoder::Factory(stream);
182
183 if (codec) {
184 success = codec->decode(stream, bm, pref, mode) != kFailure;
185 if (success && format) {
186 *format = codec->getFormat();
187 if (kUnknown_Format == *format) {
188 if (stream->rewind()) {
189 *format = GetStreamFormat(stream);
190 }
191 }
192 }
193 delete codec;
194 }
195 return success;
196 }
197
decodeYUV8Planes(SkStream * stream,SkISize componentSizes[3],void * planes[3],size_t rowBytes[3],SkYUVColorSpace * colorSpace)198 bool SkImageDecoder::decodeYUV8Planes(SkStream* stream, SkISize componentSizes[3], void* planes[3],
199 size_t rowBytes[3], SkYUVColorSpace* colorSpace) {
200 // we reset this to false before calling onDecodeYUV8Planes
201 fShouldCancelDecode = false;
202
203 return this->onDecodeYUV8Planes(stream, componentSizes, planes, rowBytes, colorSpace);
204 }
205